<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title></title>
	</head>
	
	<body>
		
	</body>
	
	<script>
	/*
		var a = 100;
		a = a + 1;
		a += 1;  //简写方式
		
		a++;
		++a;
		
		console.log(++a); //105
		console.log(a++); //105
		console.log(a);
	*/
	
		var k = 0;
		console.log(k + ++k + k++ + k + ++k + k--); //10
		
		//          0 +  1  +  1  + 2 +  3  + 3
		
		
		
	</script>
	
	
</html>



